Add readme describing server monorepo contents

server/README.md

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+# Projects in this monorepo
+
+This monorepo uses [_NPM Workspaces_](https://docs.npmjs.com/cli/v8/using-npm/workspaces) and contains both language servers for Galaxy workflows, `gxformat2` and `native (legacy)` along with some local dependencies.
+
+To install dependencies in any of the contained projects you need run the `npm install` command in this root directory and provide the `-w` parameter with the name of the target workspace. For example to install a new dependency called `my-dep` for the `gxformat2 language server` you should use:
+
+```
+npm install my-dep -w gx-workflow-ls-format2
+```
+
+## Galaxy Workflow Language Servers
+
+### gx-workflow-ls-format2
+
+This project contains the [LSP](https://microsoft.github.io/language-server-protocol/) implementation for the [gxformat2](https://github.com/galaxyproject/gxformat2) Galaxy workflow format in YAML.
+
+### gx-workflow-ls-format2
+
+This project contains the [LSP](https://microsoft.github.io/language-server-protocol/) implementation for the legacy native (.ga) Galaxy workflow format in JSON.
+
+## Packages
+
+### packages/server-common
+
+This library contains common classes, interfaces and type definitions used by both language server implementations.
+
+### packages/yaml-language-service
+
+This library implements a language service to provide basic _smarts_ for YAML documents. It is based and inspired by both the [YAML Language Server](https://github.com/redhat-developer/yaml-language-server) implementation from Red Hat and the [vscode-json-languageservice](https://github.com/microsoft/vscode-json-languageservice) by Microsoft.